It is beacuse formulas like TODAY() are self calculating formulas and they are calculated automaticallty everytime you open your workbook.
Important: Expect your workbooks to show save prompt whenever you close them after using such formulas. If value is over 52 it subtracts 52 from it, if value is below zero it adds 52 to it, if the value is betweem 0 and 53 then it doesn’t do any correction. Here is formulas final form:Ībove formula checks the week number value. By using IF() function, we’ll set sum conditional controls. To overcome this problem, you should add some controls into your formulas. Similarly, you will get results like Week56 during the end of any year if you setup future dates like =WEEKNUM(TODAY())+4. So in the beginning and end of each year, above formula will give you results like Week-2 during first weeks of new year. Important: Do not forget that there are certain amount of days, weeks, months in a year. All we need to worry about is to update sales numbers. This way our table headers will automatically adjust with each passing week. (We use WEEKNUM() function here to fetch week numbers.) So we setup our table headers like show below: We want headers to adjust themselves every week automatically. We have a rolling 6 weeks sales table for our ice-cream stalls. Here is an example about how to use them in headers: Today: =TODAY(), yesteday: =TODAY()-1, tomorrow: =TODAY()+1 You can use TODAY() function to get current day.Ĭurrent year: =YEAR(TODAY()) ,last year: =YEAR(TODAY())-1, next year: =YEAR(TODAY())+1Ĭurrent month: =MONTH(TODAY()) ,last month: = MONTH(TODAY())-1, next month: = MONTH(TODAY())+1 It is always a good practice to take current day as starting point. If you are not, I advice you to check Excel Date Functions in Use before you proceed for better understanding the concept. You need to be familiar with Excel Date Functions in order to benefit from this post.
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